Machinist&#39;s try-square.



No. 738,422. PATENIED SEPT. s, 1903.

A. DUFFY. MAGHINISTS TRY-SQUARE.

APPLICATION FILED JULY 14, 1902. H0 MODEL.

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No. 738,422. PATENTED SEPT. 8, 1903.

A. DUFFY.

MAGHINISTS TRY-SQUARE.

APPLICATION FILED JULY 14, 1902.

K0 MODEL. 2 SHEETS-SHEET 2.

' fastening means by which the blade is held UNITED STATES PatentedSeptember 8, 1 903.

PATENT OEEIcE.

ANTHONY DUFFY, OF SAN MACHINISTS FRANCISCO, CALIFORNIA.

TRY-SQUARE.

SPECIFICATION forming part of Letters Patent N 0. 738,422, datedSeptembe 8, 1903,

Application filed July 14, 1902.

To all whom it may concern:

Be it known that I, ANTHONY DUFFY, a citizen of the United States, and aresident of the city and county of San Francisco and State ofCalifornia, have invented a new and useful Improvement in MachinistsTry-Squares, of which the following is a specification.

This invention has for its object the production of an improvedtry-square for machinists formed of separable parts or members capableof being disconnected and brought into small com pass and containingwhen assembled and joined together a try-square, a rule, calipers,center-square, and straightedge.

To such end and object chiefly my said invention comprises certain novelconstruction and combination of blade, stock, and fastening devices, ashereinafter fully described, and pointed out in the claims at the end ofthis specification.

The accompanying drawings herein re-- ferred to represent an improvedimplement embodying my said invention, Figure 1 'being a perspectiveView of the same having the several functions of a rule, a try-square,calipers, and straight-edge. Fig. 2 is a detail plan of the blade. Fig.3 is a plan of the stock separated from the blade. Fig. 4 is alongitudinal sectional view of the stock; Fig. 5, an end View of thestoclgtaken from the right side of Fig.4. Fig. 6 is a detail top view ofthe adjustable block that forms part of the in the stock. Fig. 7 is atop view of the stock and angle-piece that is provided for use when theimplement is used as a center-square.

The blade at has along slot 2 longitudinally through the center andnearly the entire length of the blade, sufficient metal being left forstrength between the endof the blade and the end of the slot. When theinstrument has two short blades instead of a single long blade, as shownin Fig. 1, both blades a a are slotted for a clamp-screw g, providedwith a thumb-nut g. This gives an extension-blade that can be lengthenedor shortened as the work requires, and the lower or movable blade at isprovided with a leg 0 on the outer end extending at right angles beyondthe side of the blade, as shown in Fig. 1, so as to form a caliper-legat that end of the tool. The end Serial 110.115.598. (No model.)

of the blade a, being let into a slit in the leg 0, is secured by screws8 8. This extensionblade a is readily detached by removing thefastening-screw g, leaving the main blade free for use with the stock1). The last-named part being thicker and heavier than the blade, as isusual in try-squares of this character, is slotted transversely in andthrough one end to admit the blade. This slot '7 is equal in width tothe thickness of the blade, and in depth it is equal, or nearly so, tothe width of the blade, the latter part being fitted squarely tojt, soas to stand exactly at right angles to the stock. The means provided forsecuring the blade and the stock together holds them rigidly at rightangles when in use and also allows the parts to be readily separatedwhen the tool is taken apart to be carried in the tool-box. Thisfastening is a permanent part of the stock, to which it is attached incondition ready for operating by hand. It consists of a slide-block d,fitted in a longitudinal slot in the end of the stock and also slottedtransversely, as shown at 3, Fig. 4. The block d has a limited movementlongitudinally, but no play or movement sidewise in the stock, and theblade at, fitting tightly in the transverse slot 3 of the block, issecured in the block by a screwfpassing through the block from the topside to the bottom and through the slot 2 in the blade. A screw-threadedrod 6, rigidly secured to the inner end of the slide-block, extendsthrough an aperture 5, bored through the solid portion of the stock fromthe bottom of the slot in a longitudinal direction toward the oppositeend, and is fitted with a nut e, havinga milled head for turning it withthe fingers. Anopening tin the stock gives space for the nut to work in,and the threaded end of the rod 6 extends through the solid metal of thestock into that opening. WVhen screwed on the rod, the flat face of thenut comes to a bearing against the end of the opening 4 and draws theslide-block backward or inward in the slot, and as the blade is confinedin the block (I by the screwfthe effect of such movementis to draw theedge of the blade a closely and squarely to a seat against the bottom ofthe slot 7 7- in the end of the stock. A light coiled spring 9,interposed between the end of the slide-block and the back of thelongitudinal slot, holds the nut against the back of the opening 4 andkeeps the nut and rod from working loose. The block and the stock arefirmly locked and'fixed at right angles to each other by this means, andby asimple turn of the nut the stock can be shifted readilyon the bladefrom the end to the middle of the blade, thus forming in one position atry-square and in the other a T- square. The blade and the stock areseparated to bring the parts into small compass for carrying in thepocket or stowing away by loosening the screw fand drawing it out of theslot in the blade. A supplemental or additional stock I), carryingangle-pieces h 7L and having the same means for securing and adjustingit to the blade, is substituted for the other stock I) when theinstrument is used as a center-square. The angle-pieces h, beingpermanently fixed to or formed integrally with the stock, extend fromone side thereof, and when the blade is fixed in position the edge nextto that side of the stock on which the angle-pieces are situated willbisect the angle included between the adjacent vertical sides of thepieces h h the same as in the ordinary center-square, wherein theangle-piece forming the head is permanently fixed to the blade. In thesupplemental stock I) the slide-block 01', red 6, and nut e areconstructed and operate the same as the fastenings on the stock I) ofthe try-square. All these parts or members are easily assembled andsecured together to produce one or the other of the beforementionedimplements, and where a single blade is preferred for use under certainconditions the extension-blade is quickly removed, leaving the implementin the handiest form for use as a try-square, a T-square, or acenter-square by proper adjustments of the stock on the blade.

Having thus fully described my invention, what I claim as new therein,and desire to secure by Letters Patent, is

1. The herein-described try-square comprising a slotted blade, a stockhaving a slot in one end extending longitudinally of the stock andthrough the same from side to side, a second slot corresponding in widthto the thickness of the blade and extending transversely across the endof the stock through the middle thereof, aslide-block in thelongitudinal slot of the stock and movable therein, said slide-blockhaving a slot in the middle extending transversely of that part, andadapted to admit the blade, a screw securing the blade totheslide-block, and on which the blade is fitted to slide for adjusting itin the block, a screw-threaded rod on the end of the slide-block havinga bearing in the stock, and a nut on the rod operating on theslide-block to draw the blade up to a solid bearing against the bottomof the transverse slot in the stock on both sides of the said block.

2. In a inachinists try-square the combination, of a blade having a slotextending longitudinally of it, a stock having a slot in the endextending longitudinally of the stock and a socket extending from theend thereof into the body of the stock, a slide-block filling said slotwidthwise, but of less dimension longitudinally, a screw-threaded rod onthe stock secured at one end to the slide-block and having a nuton theopposite end, the stock and the slide-block being slotted transverselyto admit the slotted blade, and a screw passing through the slottedblade and the slide-block and securing the former rigidly in the latterpiece.

In testimony whereof I have signed my name in the presence of twosubscribing Witnesses.

ANTHONY DUFFY.

Witnesses:

J. H. BROWNING, A. W. HANSEN.

